@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
  color-scheme: dark;
  font-family: 'Space Grotesk', sans-serif;
  background: #080a0d;
  color: #ecf5ed;
  --lime: #a8ff60;
  --red: #ff5568;
  --panel: #101419;
  --line: #283039;
}

* { box-sizing: border-box; }
body { margin: 0; overflow: hidden; }
button { font: inherit; color: inherit; }

.app { display: grid; grid-template-columns: minmax(0, 1fr) 410px; height: 100vh; }
#game { position: relative; min-width: 0; background: radial-gradient(circle at 50% 50%, #17211b, #080a0d); }
#game canvas { display: block; width: 100%; height: 100%; }
.brand { position: absolute; top: 24px; left: 28px; z-index: 2; letter-spacing: .14em; font-weight: 700; }
.brand span { color: #758078; font: 12px 'DM Mono'; margin-left: 8px; }

.panel { display: flex; flex-direction: column; gap: 18px; padding: 28px 32px 20px; border-left: 1px solid var(--line); background: rgba(16,20,25,.98); overflow-y: auto; }
.eyebrow { margin: 0 0 8px; color: var(--lime); font: 500 11px 'DM Mono'; letter-spacing: .18em; }
h1 { margin: 0; font-size: 28px; letter-spacing: -.04em; }
.description { color: #909a93; font-size: 13px; line-height: 1.7; }

.code-card { overflow: hidden; border: 1px solid #344038; border-radius: 10px; background: #090c0e; box-shadow: 0 20px 50px #0006; }
.code-header { display: flex; justify-content: space-between; padding: 11px 15px; border-bottom: 1px solid #242b2f; color: #7f8983; font: 11px 'DM Mono'; }
pre { margin: 0; padding: 17px 10px; font: 14px/2 'DM Mono'; }
code span { display: block; padding: 0 10px; border-left: 2px solid transparent; color: #b6bdb8; transition: .2s; }
code span.active { border-left-color: var(--lime); background: #a8ff6012; color: #fff; }
code span.done { color: #536058; }
code b { color: #c48cff; font-weight: 500; }

.controls { margin-top: auto; }
.control-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.control-grid button, .retry { min-height: 59px; border: 1px solid #303941; border-radius: 7px; background: #171c21; cursor: pointer; transition: .15s; }
.control-grid button:hover, .control-grid button:focus-visible { border-color: var(--lime); transform: translateY(-2px); }
.control-grid button:nth-child(4) { grid-column: span 2; }
kbd { display: block; color: var(--lime); font: 500 13px 'DM Mono'; }
.control-grid span { font: 10px 'DM Mono'; color: #89938d; }
.secondary-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.retry { width: 100%; min-height: 38px; margin-top: 8px; font: 11px 'DM Mono'; }
.retry kbd { display: inline; }
.retry.next { border-color: #587b5d; color: var(--lime); }
.retry:disabled { opacity: .3; cursor: not-allowed; }
.test-start { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 10px; }
.test-start label { color: #77827b; font: 10px 'DM Mono'; letter-spacing: .12em; }
.test-start select { min-width: 0; height: 32px; padding: 0 28px 0 10px; border: 1px solid #344038; border-radius: 5px; background: #090c0e; color: var(--lime); font: 11px 'DM Mono'; cursor: pointer; }
.test-start select:focus { outline: 1px solid var(--lime); outline-offset: 1px; }
.stage-nav { display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; }
.stage-nav button { height: 28px; border: 1px solid var(--line); border-radius: 4px; background: #12171b; color: #66716a; font: 10px 'DM Mono'; cursor: pointer; }
.stage-nav button.active { border-color: var(--lime); color: var(--lime); }
.stage-nav button.cleared { background: #a8ff6014; color: #a8ff60; }
.log { padding-top: 16px; border-top: 1px solid var(--line); color: #727d76; font: 11px 'DM Mono'; }
.log span { animation: blink 1s steps(1) infinite; }
.log.error { color: var(--red); }
.log.success { color: var(--lime); }

.message { position: absolute; z-index: 3; top: 50%; left: 50%; transform: translate(-50%,-50%); padding: 22px 34px; border: 1px solid var(--lime); background: #08100ddd; color: var(--lime); font: 700 24px 'DM Mono'; letter-spacing: .14em; backdrop-filter: blur(10px); }
.message.error { border-color: var(--red); color: var(--red); }
.hidden { display: none; }
@keyframes blink { 50% { opacity: 0; } }

@media (max-width: 800px) {
  body { overflow: auto; }
  .app { grid-template-columns: 1fr; grid-template-rows: 58vh auto; height: auto; min-height: 100vh; }
  .panel { padding: 25px 20px; border-left: 0; border-top: 1px solid var(--line); }
}